The solubility of BaCO3 ---increases/decreases/stays the same--- when the pH is lowered. The CO32− anions are basic and react with H3O ions, and the dissociation of BaCO3 ---increases/decreases/stays the same---.
a) Increases, increases
b) Decreases, decreases
c) Stays the same, increases
d) Decreases, stays the same

Q&A Education